TMS9900
16-bit microprocessor / From Wikipedia, the free encyclopedia
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The TMS9900 was one of the first commercially available, single-chip 16-bit microprocessors.[lower-alpha 1] Introduced in June 1976, it implemented Texas Instruments' TI-990 minicomputer architecture in a single-chip format, and was initially used for low-end models of that lineup.
Designer | Texas Instruments |
---|---|
Bits | 16-bit |
Introduced | 1976 |
Design | CISC |
Endianness | Big |
Registers | |
PC, WP, ST | |
General-purpose | 2 internally located in processor (WP, ST) 16 × 16-bit workspace located in external RAM |
Its 64-pin DIP format made it more expensive to implement in smaller machines than the more common 40-pin format, and it saw relatively few design wins outside TI's own use. Among those uses was their TI-99/4 and TI-99/4A home computers, which ultimately sold about 2.8 million units.
Microcomputer-on-chip implementations of the 9900 in 40-pin packages included the TMS9940, TMS9980/81, TMS9995. The TMS99105/10 was the last iteration of the 9900 in 1981 and incorporated features of TI's 990/10 minicomputer.[1]
By the mid-1980s the microcomputer field was moving to 16-bit systems like the Intel 8088 and newer 16/32-bit designs like the Motorola 68000. With no obvious future for the chip, TI turned its attention to special-purpose processors like the Texas Instruments TMS320, introduced in 1983.